<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>点击进度条</title>
  <link rel="stylesheet" href="./style.css">
</head>
<body>  
  <div class="container">
    <div class="progress_cont">
      <div class="progress" id="progress"></div>
      <div class="circle active">1</div>
      <div class="circle">2</div>
      <div class="circle">3</div>
      <div class="circle">4</div>
    </div>
    <button class="btn" id="prev" disabled>上一个</button>
    <button class="btn" id="next">下一个</button>
  </div>
  <script src="./script.js"></script>
</body>
</html>